Molecular sieves 5A
Molecular sieves 5A
CAS: 69912-79-4
Molecular Formula: CanNa12-2n[(AlO2)12(SiO2)12]xH2O
Molecular sieves 5A - Names and Identifiers
Molecular sieves 5A - Physico-chemical Properties
| Molecular Formula | CanNa12-2n[(AlO2)12(SiO2)12]xH2O |
| Molar Mass | 60.08 |
| Water Solubility | Insoluble in water. |
| Appearance | powder |
| Color | White to off-white |
| Storage Condition | Room Temprature |
| Sensitive | Hygroscopic |
| MDL | MFCD00147627 |
| Physical and Chemical Properties | White powder with microporous structure. Non-toxic, odorless. |
| Use | Used as a petroleum cracking catalyst, can also be used as an adsorbent |
Molecular sieves 5A - Risk and Safety
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
| WGK Germany | 3 |
| RTECS | ZG6800000 |
| FLUKA BRAND F CODES | 3-9 |
| HS Code | 28421000 |
Molecular sieves 5A - Upstream Downstream Industry
Molecular sieves 5A - Nature
Open Data Verified Data
white powder with microporous structure. Non-toxic, odorless. No burning or explosion. Soluble in strong acid and alkali, insoluble in water and organic solvents. The pore size is about 5 x 10 -10m. It has the characteristics of high adsorption capacity and selective adsorption according to molecular size. It also has Ion exchange capacity and catalytic activity. At higher temperatures still have good adsorption capacity. Has a great affinity for water.
Last Update：2024-01-02 23:10:35
Molecular sieves 5A - Preparation Method
Open Data Verified Data
hydrothermal synthesis method: water glass, sodium aluminate, sodium hydroxide as raw materials. See 3A Molecular sieve for the preparation of a dilute solution of water glass and the preparation of a sodium metaaluminate solution. The water glass, sodium metaaluminate, sodium hydroxide according to a certain molar ratio of mixed reaction, temperature control at more than 40 deg C, and strongly stirred, the reaction of the formation of the gel heated to 102 ℃ ± 2 ℃, and static crystallization at this temperature, after filtration and washing, adding calcium chloride for ion exchange (exchange degree 70%), and then after filtration and washing, drying, adding adhesive kneading, molding, finally, 5A Molecular sieve was prepared by burning and activation.
Last Update：2022-01-01 11:03:33
Molecular sieves 5A - Introduction
The pore size of 5A molecular sieve is about 5 angstroms. The effective aperture is 0-5~0-57nm. It's irritating. Soluble in strong acid or alkali and decompose, insoluble in water and organic solvents. It's hygroscopic.
Last Update：2022-10-16 17:28:02
Molecular sieves 5A - Use
Open Data Verified Data
used for the separation of N-and ISO-alkanes, deep drying and purification of gases and liquids, separation of oxygen and nitrogen, desulfurization of petroleum and petroleum gas. It can be used as an adsorbent in dewaxing technology using steam as a desorbent.
Last Update：2022-01-01 11:03:32
Molecular sieves 5A - Safety
Open Data Verified Data
packed in a carton or drum lined with polyethylene plastic bag, net weight 20kg, 30kg. They were stored in a dry warehouse. Do not store and mix with strong acid and strong alkali. Mixing with oil or other liquid organic matter is prohibited. When loading and unloading should be light to prevent packaging damage. Avoid water immersion. Toxicity and protection: inhalation of dust can cause "pneumoconiosis" lung sclerosis. Pay attention to dust prevention.
Last Update：2022-01-01 11:03:33
Molecular sieves 5A - Reference Information
| What is a molecular sieve? | molecular sieve is a kind of natural or synthetic zeolite type Hydrated aluminosilicate. The general formula is M2/nO. Al2O3. xSiO2. yH2O. It has a porous skeleton structure, in which there are many channels with uniform pore size and cavities arranged in a regular manner and with a large inner surface. These crystals can only allow molecules with a diameter smaller than the hole aperture to enter, thus allowing molecules of different sizes to be separated and act as a "sieve. In the general formula, M represents an n-valent metal ion. Molecular sieve powder Crystal, metallic luster, hardness of 3~5. Density of 2~2.8g/cm 3. Natural zeolite colored, synthetic zeolite is white, insoluble in water. The thermal stability and acid resistance increase with the increase of SiO2/Al2O3 composition ratio. Molecular sieves have different pore sizes and large specific surface areas, which generally reach 300-1000/G. |
| solid adsorbent | molecular sieves are widely used as solid adsorbents in chemical industry, petroleum industry and other relevant departments and experiments. The adsorbed material can be desorbed by appropriate treatment (e. G., heating), a process known as "regeneration", whereby the molecular sieve can be reused. Molecular sieves are used in the drying of gases and liquids and in the dehydration of compounds (the removal of water for crystallization, or the removal of hydroxyl and hydrogen atoms on close two atoms of a compound molecule in the form of water). A molecular sieve with a suitable pore size can be selected to adsorb a specific substance in the mixture for the purpose of separation or purification. |
| molecular sieve catalyst | the catalyst with molecular sieve as the active component is called molecular sieve catalyst. The most industrially used molecular sieve catalysts are cracking catalysts in the petroleum refining industry. In addition, there are catalysts that catalyze organic synthesis and other properties. Molecular sieve catalysts usually contain only 5-15% of the molecular sieve, the remainder being the substrate. The matrix is often composed of refractory inorganic oxides or mixtures thereof and clays. M in the general formula of molecular sieve is usually Na +, K +, Ca2 +, and these ions can be partially or completely replaced by metal ions with small radius and more charge, so that the framework structure is basically unchanged, however, it has a great influence on the performance of molecular sieve, which can make it have specific catalytic properties. In recent years, other atoms (such as gallium, germanium, iron, boron, phosphorus, chromium, vanadium, molybdenum and arsenic) are introduced into the silicon aluminum framework of molecular sieves to replace (or partially replace) silicon or aluminum, the formation of heteroatom molecular sieve has some special catalytic properties. The synthesis of a series of aluminophosphate molecular sieves was reported in 1982, and a series of silico-aluminophosphate molecular sieves appeared in 1984. Molecular sieve can also be used for gasoline, jet fuel and diesel oil dewaxing operation, called molecular sieve dewaxing. |
| toxicity | inhalation of dust will cause "pneumoconiosis" pneumosclerosis. Pay attention to dust prevention. |
| Use | as a petroleum cracking catalyst, can also be used as an adsorbent for the separation of N-and ISO-alkanes, deep drying and purification of gases and liquids, separation of oxygen and nitrogen, desulfurization of petroleum and petroleum gases. It can be used as an adsorbent in dewaxing technology using steam as a desorbent. selective adsorbent for the separation of n-alkanes from petroleum fractions . A catalyst or catalyst support. It is used for the separation of N-and ISO-alkanes, the separation of oxygen and nitrogen, the desulfurization of petroleum and petroleum gas, and the drying and purification of gases and liquids. |
| production method | hydrothermal synthesis method uses water glass, sodium aluminate and sodium hydroxide as raw materials. See 3A Molecular sieve for the preparation of a dilute solution of water glass and the preparation of a sodium metaaluminate solution. The water glass, sodium aluminate, sodium hydroxide according to a certain molar ratio of mixing (generally Al2O3:SiO2:Na2O:H2O = l:2:3:185), reaction, temperature control at 40 ℃ or above, and vigorously stirred, the reaction of the resulting gel temperature to 102 ℃ ± 2 ℃, and static crystallization at this temperature, after filtration and washing, adding calcium chloride for ion exchange (exchange degree of 70%), after filtration and washing, drying, kneading and molding by adding Binder, 5A Molecular sieve was finally prepared by burning and activation. |
Last Update：2024-04-10 22:29:15
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Raw Materials for Molecular sieves 5A